SoundSoftware Code Site

#!/bin/sh

mirrordir="/var/mirror"

hg="/usr/bin/hg"

project="$1"

local_repo="$2"

remote_repo="$3"

if [ -z "$project" ] || [ -z "$local_repo" ] || [ -z "$remote_repo" ]; then

    echo "Usage: $0 <project> <local-repo-path> <remote-repo-url>"

    exit 2

fi

  # We need to handle different source repository types separately.

  #

  # The convert extension cannot convert directly from a remote git

  # repo; we'd have to mirror to a local repo first.  Incremental

  # conversions do work though.  The hg-git plugin will convert

  # directly from remote repositories, but not via all schemes

  # (e.g. https is not currently supported).  It's probably easier to

  # use git itself to clone locally and then convert or hg-git from

  # there.

  #

  # We can of course convert directly from remote Subversion repos,

  # but we need to keep track of that -- you can ask to convert into a

  # repo that has already been used (for Mercurial) and it'll do so

  # happily; we don't want that.

  #

  # Converting from a remote Hg repo should be fine!

  #

  # One other thing -- we can't actually tell the difference between

  # the various SCM types based on URL alone.  We have to try them

  # (ideally in an order determined by a guess based on the URL) and

  # see what happens.

project_mirror="$mirrordir/$project"

mkdir -p "$project_mirror"

project_repo_mirror="$project_mirror/repo"

  # Some test URLs:

  #

  # http://aimc.googlecode.com/svn/trunk/

  # http://aimc.googlecode.com/svn/

  # http://vagar.org/git/flam

  # https://github.com/wslihgt/IMMF0salience.git

  # http://hg.breakfastquay.com/dssi-vst/

  # git://github.com/schacon/hg-git.git

  # http://svn.drobilla.net/lad (externals!)

# If we are importing from another distributed system, then our aim is

# to create either a Hg repo or a git repo at $project_mirror, which

# we can then pull from directly to the Hg repo at $local_repo (using

# hg-git, in the case of a git repo).

# Importing from SVN, we should use hg convert directly to the target

# hg repo (or should we?) but keep a record of the last changeset ID

# we brought in, and test each time whether it matches the last

# changeset ID actually in the repo

success=""

# If we have a record of the last successfully updated remote repo

# URL, check it against our current remote URL: if it has changed, we

# will need to start again with a new clone rather than pulling

# updates into the existing local mirror

successfile="$project_mirror/last_successful_url"

if [ -f "$successfile" ]; then

    last=$(cat "$successfile")

    if [ x"$last" = x"$remote_repo" ]; then

	echo "$$: Remote URL is unchanged from last successful update"

    else

	echo "$$: Remote URL has changed since last successful update:"

	echo "$$: Last URL was $last, current is $remote_repo"

	suffix="$$.$(date +%s)"

	echo "$$: Moving existing repos to $suffix suffix and starting afresh"

	mv "$project_repo_mirror" "$project_repo_mirror"."$suffix"

	mv "$local_repo" "$local_repo"."$suffix"

	mv "$successfile" "$successfile"."$suffix"

	touch "$project_mirror/url_changed"

    fi

fi

if [ -d "$project_repo_mirror" ]; then

    # Repo mirror exists: update it

    echo "$$: Mirror for project $project exists at $project_repo_mirror, updating" 1>&2

    if [ -d "$project_repo_mirror/.hg" ]; then

	"$hg" --config extensions.convert= convert --datesort "$remote_repo" "$project_repo_mirror" && success=true

	if [ -z "$success" ]; then

	    ( cd "$project_repo_mirror" && "$hg" pull "$remote_repo" ) && success=true

	fi

    elif [ -d "$project_repo_mirror/.git" ]; then

	( cd "$project_repo_mirror" && git pull "$remote_repo" master ) && success=true

    else

	echo "$$: ERROR: Repo mirror dir $project_repo_mirror exists but is not an Hg or git repo" 1>&2

    fi

else

    # Repo mirror does not exist yet

    echo "$$: Mirror for project $project does not yet exist at $project_repo_mirror, trying to convert or clone" 1>&2

    case "$remote_repo" in

	*git*)

	    git clone "$remote_repo" "$project_repo_mirror" ||

	    "$hg" --config extensions.convert= convert --datesort "$remote_repo" "$project_repo_mirror"

	    ;;

	*)

	    "$hg" --config extensions.convert= convert --datesort "$remote_repo" "$project_repo_mirror" ||

	    git clone "$remote_repo" "$project_repo_mirror" ||

	    "$hg" clone "$remote_repo" "$project_repo_mirror"

	    ;;

    esac && success=true

fi

echo "Success=$success"

if [ -n "$success" ]; then

    echo "$$: Update successful, pulling into local repo at $local_repo"

    if [ ! -d "$local_repo" ]; then

	"$hg" init "$local_repo"

    fi

    if [ -d "$project_repo_mirror/.git" ]; then

	( cd "$local_repo" && "$hg" --config extensions.hggit= pull "$project_repo_mirror" ) && echo "$remote_repo" > "$successfile"

    else

	( cd "$local_repo" && "$hg" pull "$project_repo_mirror" ) && echo "$remote_repo" > "$successfile"

    fi

fi